Brocade Fabric OS Troubleshooting and Diagnostics Guide (Supporting Fabric OS v7.3.0) - Manual (Page 73)

Fabric OS Troubleshooting and Diagnostics Guide 57
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Considerations for downgrading firmware
5
Upgrade to 7.2 is not allowed since base switch has R_RDY enabled ports.
Please disable the R_RDY enabled ports in base switch using portcfgislmode
command.
Firmware upgrade to Fabric OS 7.2.0 or higher is not allowed when there are
more than 4 chassis connected through Inter-Chassis Links (ICLs) and the
Enterprise ICL (EICL) license is not installed in the system. Note that even
with an EICL license installed, only 9 chassis are allowed to connect through
ICLs. You can either install an EICL license, or you must disable the
additional ICL links before performing a firmware upgrade.
The following example shows hardware-related messages for a downgrade:
ecp:admin> firmwaredownload
Type of Firmware (FOS, SAS, or any application) [FOS]:
Server Name or IP Address: 10.1.2.3
User Name: userfoo
File Name: /home/userfoo/v6.3.0
Network Protocol (1-auto-select, 2-FTP, 3-SCP) [1]:
Password:
Checking System Settings...
Version compatibility check passed.
Checking version compatibility...
Version compatibility check passed..
The following items must be addressed before downloading the specified
firmware:
FC8-32E and FC8-48E are not supported by the targeted firmware. Please use
slotshow to determine which of these are installed and remove them before
continuing.
The following messages are displayed if an exception case is encountered during firmware
downgrade. The following example shows feature-related messages that you may see if you were
downgrading from Fabric OS v7.2.0 to v7.1.0:
Downgrade is not allowed as QoS mode is enabled (ON) on some of the ports (
other than E_Port(s) and F_Port with AoQ feature ) and there is no Adaptive
Networking license installed on the switch. To proceed further with downgrade
either install Adaptive Networking license, or set QoS mode to OFF/AE. Please
use "portcfgqos --disable [slot/]port" to set QoS mode on these ports to OFF
or use "portcfgqos --default [slot/]port" to set QoS mode on these ports to
AE.
Downgrade is not allowed as some of the E_Port(s) are using QoS feature and
there is no Adaptive Networking license installed on the switch.To proceed
further with downgrade either install Adaptive Networking license, or set QoS
mode on these ports to OFF. Please use "islshow" to view list of E_Port with
QoS feature enabled and use "portcfgqos --disable [slot/]port" to set QoS mode
on these ports to OFF.
Downgrade to selected version is not allowed. Please remove E-Port Credit
configuration using "portcfgdefault" or "portcfgeportcredits --disable" CLI on
these ports.
Downgrade is not allowed because Flow Vision is configured. Please delete all
the flows using "flow" CLI.